ABAP Select data from SAP table /SYCLO/MSG02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SYCLO/MSG02 table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to /SYCLO/MSG02. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the /SYCLO/MSG02 table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_/SYCLO/MSG02 TYPE STANDARD TABLE OF /SYCLO/MSG02,
      WA_/SYCLO/MSG02 TYPE /SYCLO/MSG02,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: </SYCLO/MSG02> TYPE /SYCLO/MSG02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/SYCLO/MSG02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SYCLO/MSG02
  INTO TABLE IT_/SYCLO/MSG02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SYCLO/MSG02
*  INTO TABLE @DATA(IT_/SYCLO/MSG022).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_/SYCLO/MSG02 INDEX 1 INTO DATA(WA_/SYCLO/MSG022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SYCLO/MSG02 ASSIGNING </SYCLO/MSG02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SYCLO/MSG02>-MANDT = 1.
</SYCLO/MSG02>-MESSAGE_GUID = 1.
</SYCLO/MSG02>-QUEUE_ID = 1.
</SYCLO/MSG02>-MOBILE_APP = 1.
</SYCLO/MSG02>-USER_GUID = 1.

ENDLOOP.

LOOP AT IT_/SYCLO/MSG02 INTO WA_/SYCLO/MSG02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SYCLO/MSG02-STORAGE_GUID, sy-vline,
  WA_/SYCLO/MSG02-EXIPRATION_TS, sy-vline,
  WA_/SYCLO/MSG02-MESSAGE_STATUS, sy-vline,
  WA_/SYCLO/MSG02-CONFIRMATION_TS, sy-vline,
  WA_/SYCLO/MSG02-READ_TS, sy-vline,
  WA_/SYCLO/MSG02-CREATED_BY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SYCLO/MSG02 you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_/SYCLO/MSG02 TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_/SYCLO/MSG02 INTO WA_/SYCLO/MSG02.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/SYCLO/MSG02_STR, 
MANDT TYPE STRING,
MESSAGE_GUID TYPE STRING,
QUEUE_ID TYPE STRING,
MOBILE_APP TYPE STRING,
USER_GUID TYPE STRING,
STORAGE_GUID TYPE STRING,
EXIPRATION_TS TYPE STRING,
MESSAGE_STATUS TYPE STRING,
CONFIRMATION_TS TYPE STRING,
READ_TS TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_TS TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_TS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SYCLO/MSG02_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_/SYCLO/MSG02_STR-MANDT sy-vline 
WA_/SYCLO/MSG02_STR-MESSAGE_GUID sy-vline 
WA_/SYCLO/MSG02_STR-QUEUE_ID sy-vline 
WA_/SYCLO/MSG02_STR-MOBILE_APP sy-vline 
WA_/SYCLO/MSG02_STR-USER_GUID sy-vline 
WA_/SYCLO/MSG02_STR-STORAGE_GUID sy-vline 
WA_/SYCLO/MSG02_STR-EXIPRATION_TS sy-vline 
WA_/SYCLO/MSG02_STR-MESSAGE_STATUS sy-vline 
WA_/SYCLO/MSG02_STR-CONFIRMATION_TS sy-vline 
WA_/SYCLO/MSG02_STR-READ_TS sy-vline 
WA_/SYCLO/MSG02_STR-CREATED_BY sy-vline 
WA_/SYCLO/MSG02_STR-CREATED_TS sy-vline 
WA_/SYCLO/MSG02_STR-CHANGED_BY sy-vline 
WA_/SYCLO/MSG02_STR-CHANGED_TS sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.